ICD-10 Code C79.6 – Secondary malignant neoplasm of ovary (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.6 – Secondary malignant neoplasm of ovary
What it is
This code identifies metastatic cancer involving the ovary, meaning a malignancy that started in another site and spread to one or both ovaries. It does not describe a primary ovarian cancer.
Clinical signs
Clinical features vary; refer to documentation. Findings may include an ovarian mass, pelvic pain, bloating, or imaging evidence of metastatic disease, but the primary cancer source should be documented when known.
When to use this code
Use C79.6 when the provider documents secondary malignant neoplasm of the ovary, ovarian metastasis, or metastatic involvement of the ovary from another primary site. Code it when the record clearly supports spread to the ovary, even if the primary malignancy is treated elsewhere. If the primary site is unknown, check documentation before assigning this code.
Do not use for
Do not use this code for primary ovarian cancer, benign ovarian masses, or nonspecific pelvic tumors. If the chart only says “metastatic cancer” without ovarian involvement, check documentation.
Coding tip
Report the primary malignancy first when known, and verify whether the ovary is documented as a metastatic site.